Screw-cutting machine



(No Model.) 2 Sheets-Sheet 1.

H. P. EILERS. SCREW CUTTING MAGHINE.

Pa ented Apr. 14, 1896.

- INVENTOI? BY I ATTOHNE rs.

NITED STATES PATENT OFFICE.

1110 P. EI'LERs, on CLEVELAND, onIo.

S CREW-CUTT|NG MACHINE.

SPECIFICATION forming part Of Letters Patent NO. 558,368, dated April 14, 1896.

Application filed July 11, 1895. Serial No. 555,632. (No model.)

To all whom it may concern;-

Be it known that 1, H10 P. EILERS, of Cleveland, C-uyahoga county, and State of Ohio, have invented a new and Improved Screw- Cutting Machine, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved triple screw-cutting machine especially designed for manufacturing purposes to produce as large a quantity of work as is possible for a single operator to handle and still enable the operator to run the machine at a rate of speed that will insure long life to the parts and dies and at the same time produce perfect work.

The invention consists of certain parts and details and combinations of the same, as will be fully described hereinafter, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming apart of this specification, in which similar characters of reference indicate corresponding parts in all'the figures.

Figure 1 is a side elevation of the improvement. Fig. 2 is a sectional side elevation of the same one the line 2 2 of Fig. 3. Fig. 8 is a plan view of the improvement. Fig. 4 is a transverse section of the bed-frame and drainage-pan and Fig. 5 is asectional side elevation of the yoke and toggle in an open position.

The triple screw-cutting machine is provided with a bed-frame A, supported on a hollow frame-leg A, supported by a suitable base A On the top of the bed-frame A are secured three head-stocks B, alike in construction and each containing a spindle O, carrying at its rear end a gear-wheel D. The three gear-wheels D are in mesh with two pinions D, placed between them, and one gear-wheel D is in mesh with a pinion E, secured on a driving-shaft E, carrying a conepulley E connected by belt with other machinery for imparting a rotary motion to the said driving shaft E and pinion E and through it to the aforesaid gear-wheel D. As the three gear-wheels are in mesh with one another by means of the pinions D placed between them, the several spindles O in the three head-stocks B are rotated simultaneously.

On the front end of each spindle O is held a die-head F, carrying. the dies G for cutting the threads on the work under treatment. The die-head F is provided with the usual die-ring F for moving the dies G into an open or closed position by imparting a longitudinal sliding forward-and-backward movement to the die-ring F, as hereinafter more fully described.-

The die ring F is provided with an annular exterior groove F in which is fitted a ring F connected at its sides by screws F' with a yoke H, f ulcrumed at its upper end by screws H on a nut H in which screws a screw-rod H mounted to turn in a split journal B forming part of the top B of the head-stock B. Collars H and H are held on the screwrod H and fit against the ends of the journal B to prevent the screw-rod H from moving laterally, and the said screw rod may be clamped in position in the said journal after adjustment is made by a clamping-screw B in the split end of the journal B On the forward end of the screw-rod H is held a knob H for turning the said screwrod H to move the nut H forward or backward, according to the direction in which the said screw-rod is turned, and as the nut H is the fulcrum for the yoke II the position of the latter is changed to permit of correspondingly adjusting the ring F to open or close the dies G to adjust the same according to the size of the work under treatment. After such adjustment is made the clamping-screw B is turned up to securely clamp the screw-rod H in place and prevent it from accidentally turning; but while the adjustment is being made the clamping-screw B is loosened sufficient-ly to permit of turning the rear end of the screw-rod in the journal B The lower end of the yoke His provided with a pivot-pin 1'1 engaged by a link I of a toggle I for imparting a swinging motion to the yoke and for locking the yoke inposition when the toggle is closed and when the dies G are in an innermost or closed position. (See Fig. 2.) The link I of the toggle is pivotally connected with a second toggle-link 1 secured on a transversely-extending shaft 1 mounted in suitable bearings in the headstock B under the spindle O, as illustrated in Fig. 2.

On the outer end of the shaft I (see Fig. 1) is secured a downwardly-extending arm I",

pivotally connected with a rod 1, engaged by a bracket K, held on the carriage K, mounted to travel in the usual manner on the front part of the bed-frame A, the said carriage be in g of any approved construction, so that further description of the same is not deemed necessary.

On the red I, on opposite sides of the bracket K, are held adjustable stops I and 1 adapted to be engaged by the bracket K as the carriage K moves inward to bring the work to the dies or moves outward to remove the threaded work from the dies. hen the carriage K moves inward, then the bracket K finally comes in contact with the stop I to cause the rod I to travel rearward with the carriage and impart a turning mot-ion by the arm I to the shaft 1 so that the toggle-links 1 and I are opened and the yoke His caused to swing rearward to the position shown in Fig. 5. \Vhen the carriage moves outwardly, the bracket K finally comes in contact with the stop 1, so that a turning motion is again given to the shaft 1 but in an opposite direction, so as to swing the toggle-links I and l into a closed position and move the yoke ll into a forward position, and also to lock it in place therein.

The pivot-pin I1? is engaged by a pressurerod L, arranged transversely and fitted to slide in a bearing A", forming part of the bedfran1e A. ()n this pressure-rod L is coiled a spring N, resting with one end on the bearing A and with its other end on a collar 0, which can be adjusted on the rod L to increase or decrease the tension of the spring N. Now it will be seen that when the toggle I is opened by the action of the bracket K striking the stop I, as previouslyexplained, then the pressure of the spring N on the rod L will cause a sudden further opening of the toggle to mo re the yoke ll and ring F, and quickly disengage the dies from the work. Vhen the toggle is closed, as previously explained, and the yoke Il springs forward, the rod L is moved outwardly, and consequently the spring N is compressed, so that on the opening of the toggles the said pressure-rod quickly finishes the opening of the toggle, as above explained.

In the hollow leg A for the bed-frame A is held removably a drainage-pan P, extendin g transversely, as plainly shown in Fig. 4:, and having a bottom P, inclined in opposite directions, with the apex at or near the middle of the pan, as will be readily understood by reference to Fig. 4. In the ends of the bottom 1 are openings covered by screens Q and discharging into oil-boxes R, provided with nipples S. Now it will be seen that the chips and oil passing into the drainage-pan I are separated therein by the oil passing through the screens Q into the oil-boxes R, and in case fine chips should pass through the screens Q they will drop to the bottoms of the boxes R, and are thus separated from the oil drawn off through the nipples S, located a suitable distance above the bottoms of the boxes. The pan P is removed from time to time to empty the chips accumulating therein.

It is understood that by the arrangen'ient described a single operator can conveniently handle the work for the three carriages K, an d at the same time the machine can be run at a rate of speed which will insure a long life to the parts and dies and also produce perfect work.

It will further be seen that by the arrangement described relative to the die-ring and yoke the clutch-ring heretofore employed in machines of this kind is entirely dispensed with, and the connection between the yoke, toggle, and diehead is so simple as not to be liable to become disarranged, and at the same time the usual wear of the machine at this point is reduced to a minimum.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A screw-cutting machine provided with a die-ring, a yoke connected with the die-ring to move the latter forward orbackward whereby the dies are moved into a closed or open position, the said yoke having an adjustable fulcrum whereby the dies are adjusted to the size of the work under treatment, means for imparting a forward and backward motion to the said yoke, and a spring-pressed pressurerod fitted to slide in a bearing on the bedframe, the said rod being moved against the tension of its spring when the yoke and diering are moved forward to close the dies, thereby insuring a quick backward movement to the yoke and die'ring to disengage the dies from the work, substantially as shown and described.

2. A screw-cutting machine provided with a die-head having a die-ring mounted to slide, a yoke pivotally connected with the said diering, a nut on which the upper end of the yoke is fulcrumed, a screw-rod engaging the said nut to move the same to adjust the fulcrum of the yoke, a split journal in which the rear end of the said screw-rod is mounted, the said screw-rod extending forward above the die-head and the forward end of said screw-rod being provided with a hand-wheel. for turning the same, and means for clamping the split journal on the said screw-rod to hold the fulcrum in the adjusted position, substantially as shown and described.

3. A screw-cutting machine, comprising a die-head having a slidable die-ring, a yoke having an adjustable fulcrum and engaging the said ring, a toggle for imparting a swinging motion to the said yoke, a shaft to which one link of the toggle is connected, a pivotpin carried by the yoke and to which the other toggle-link is connected, a carriage mounted to travel on the bed-frame, and a rod connected with the said shaft and adapted to be moved by the movement of the carriage to open and close the toggle, substantially as shown and described.

4. A screw-cutting machine, comprising a die-head having a slidable die-ring, a yoke adjustably fulcrumed at its upper end and connected with the said die-ring, the lower end of the said yoke being provided with a pivot pin, a transversely extending shaft mounted in suitable bearings and provided with an arm, a toggle for imparting a swinging motion to the said yoke, the links of the said toggle being connected respectively with the pivot-pin of the yoke and the. transverselyextending shaft, a carriage mounted to travel on the bed-frame and provided with a bracket, and a rod pivotally connected with the arm on the transversely-extending shaft and having adjustable stops adapted to be engaged by the bracket 011 the carriage, substantially as shown and described.

5. A screw-cutting machine, comprising a die-head having a slidable die-rin g, a yoke engaging the said ring, a toggle for imparting a swinging motion to the said yoke, a shaft to which one link of the toggle is connected, a pivot-pin carried by the yoke and to which the other toggle-link is connected,a carriage mounted to travel on the bed-frame, a rod connected with the toggle-shaft and adapted to be moved by the movement of the carriage to open and close the toggle, and means for insuring a quick opening of the toggle after the links thereof are unlocked, substantially as shown and described.

0. A screw-cutting machine, comprising a die-head having a slidable die-ring, a yoke adjustablyfulcrumed at its upper end and connected with the said die-ring, the lower end of the said yoke being provided with a pivotpin, a transversely-eXtending shaft mounted in suitable bearings and provided with an arm, a toggle for imparting a swinging motion to the said yoke, the links of the said toggle being connected respectively with the pivotpin of the yoke and the transversely-extending shaft, a carriage mounted to travel on the bed-frame and provided with a bracket, a rod pivotally connected with the arm on the transverse] y-extendin g shaft and having adjustable stops adapted to be engaged by the bracket on the carriage to open and close the toggle, and a spring-pressed pressure-rod engaging the pivot-pin of the yoke for insuring a quick opening of the toggle after the links thereof are unlocked, substantially as shown and described.

7. A screw-cutting machine, comprising a die-head having a slidable die-ring, a yoke engaging the said ring, a toggle for imparting a swinging motion to the said yoke, a carriage mounted to travel on the bed-frame and adapted to open and close said toggle, and a spring-pressed rod fitted to slide in a bearing on the bed-frame and connected to the said toggle, the said rod being moved against the tension of the spring when the toggle is closed thereby compressing the spring and insuring a quick opening of the toggle when the links are unlocked, substantially as shown and described.

8. A screw-cutting machine, comprising a die-head having a slidable die-ring, a yoke having an adjustable fulcrum and engaging the said ring, a toggle for imparting a swinging motion to the said yoke, a rod connected with the toggle-shaft and having adjustable stops adapted to be engaged by a bracket on the carriage, to open and close the toggle, and

a spring-pressed pressure-rod connected with the said toggle for insuring a quick opening of the toggle after the links thereof are unlocked, substantially as shown and described.

9. A screw-cutting machine provided with a removable drainage-pan having a bottom inclining from the middle in opposite directions, and screened apertures in the bottom of the said pan at the ends thereof, and oilboXes under the said screen-openings provided with oil-discharge nipples located above the bottoms of the said boxes, substantially as shown and described.

HIO P. EILERS.

lVitnesses:

D. R. DAVIES, F. W. Bar on. 

